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LandPirateMBC 11-05-2012 10:44 AM

Suzuki GS400 advice
Just added a 78 gs400 to the stable. Anyone have experience in performance parts for them? Mostly looking for an exhaust upgrade. The previous owner ditched the stock exhaust and added a straight pipe onto the stock header pipe that is loud ugly and kinda makes it sound like a two stroke that is running wayyyy too rich. I'm in the middle of a cafe racer build with it and would like to find some pipes that will give it a little more punch. Perhaps Yoshimura made something that fits?:ear

JerryH 11-05-2012 12:29 PM

The Suzuki GS400/425/450/500 was one of the most reliable bikes ever built. I had an '80 GS450L that had 34,000 miles on it when I got it, and had obviously been crashed many times. I put at least another 15,000 miles on it, mostly commuting, but with a couple of 1000 mile trips at freeway speeds thrown in. The ONLY problem I ever had with it was the plastic master cylinder reservoir turned to dust in the AZ sun. I replaced the master cylinder with one from another Japanese bike. It was still running like new when I sold it. All I ever did maintenance wise was change the oil. I never even checked the valves.

The problem with those bikes now, and even back in the mid '90s when I bought that one, which had the stock exhaust, is that there is an almost total lack of parts available for them. I doubt anyone made an aftermarket exhaust for them that long ago. And since they are not considered collector bikes like the SOHC Honda fours, you will find few parts on eBay either.

There may be some degree of parts interchangeability between the different displacement versions of this engine. I would check with the Vintage Japanese Motorcycle Owners Group @

Best of luck with it.

Sniper X 11-05-2012 12:58 PM

IF anything is still available, it'll be a header made by MAC and found on Ebay. You might do a statewide criagslist search for an aftermarket header for one that someone is trying to sell. I will warn it aint gonna be fast unless you rip the head off, find a set of cams, port it and do a quality header, and flat slide carbys. BUT then it'll friggin scream for what it is. Might also find a GS400 specific forum.

NJ-Brett 11-05-2012 01:00 PM

Nice looking bikes, I like the look stock.
Its a shame they don't make something like that anymore.
Parts may be a problem...

Navin 11-05-2012 01:06 PM

Supertrapp it or start shopping for stock sportbike cans, plentiful and cheap. Another source is stock KTM cans off SX and EXCs. Aluminum, good quality and decent looking.

LandPirateMBC 11-09-2012 06:28 PM

Turn out bike bandit has a 2 into 1 megaphone exhaust that will lower the weight, add to the ground clearance and provide a little more power. Its about $300. So that's the plan unless something better pops up.

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